[" Concave and convex lenses are placed "],[" touching each other.The ratio of "],[" magnitudes of their power is 2:3.The "],[" focal length of the system is "30cm" .Then "],[" the focal lengths of individual lenses are: "]

Concave and convex lenses are placed touching each other. The ratio of magnitudes of their power is 2:3. The focal length of system is 30cm. The focal lengths of individual lenses are (A) -75 50 (B) -15.10 (C) 75 -50 (D) 25.-10

A comvex lens and a concave lens are placed in contact. The ratio of magnitude of the power of the convex lens to that of the concave lens is 4:3. If the focal length of the convex lens is 12 cm, then the focal length of the combination will be

A comvex lens and a concave lens are placed in contact. The ratio of magnitude of the power of the convex lens to that of the concave lens is 4:3. If the focal length of the convex lens is 12 cm, then the focal length of the combination will be

A convex lens is in contact with a concave lens. The magnitude of the ratio of their powers is (3)/(2) . Their equivalent focal length is 30 cm. What are their individual focal lengths?

A convex lens is in contact with a concave lens. The magnitude of the ratio of their powers is (3)/(2) . Their equivalent focal length is 30 cm. What are their individual focal lengths?

A convex lens is in contact with concave lens .The magnitude of the ratio of their focal length is 2//3 .Their equivalent focal length is 30 cm.What are their individual focal lengths?